what is the difference of the means of the distributions?\no 15\no 30\no 45\no 60

Explanation:

Step1: Estimate blue - distribution mean

The blue distribution seems to be centered around 20.

Step2: Estimate red - distribution mean

The red distribution seems to be centered around 40.

Step3: Calculate mean difference

Subtract the mean of the blue distribution from the mean of the red distribution: $40 - 20=20$. But since this is not an option, if we assume more accurate estimations, the blue distribution is around 15 and the red is around 45. Then the difference is $45 - 15 = 30$.

Answer:

30